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Home › Process for dyeing hair by the sequential treatment of hair with metal ion-containing composition and with a dye composition containing 5,6-dihydroxyindole-2-carboxylic acid and certain derivatives thereof

Process for dyeing hair by the sequential treatment of hair with metal ion-containing composition and with a dye composition containing 5,6-dihydroxyindole-2-carboxylic acid and certain derivatives thereof

US Patent 5346509 · Granted Sep 13, 1994

Estimated economic value: $60,241,000 ⓘ

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